Two grounding methods can be used when installingthe HP Dual I/O 2.5" DC-power Drive Enclosure:•

Grounding using cables from the power-and-coolingmodule

•

Grounding using a single wire from the front of thechassis ears

> Grounding using cables from the power-and-coolingmodule <

Two DC power cables are packaged with each diskenclosure. Use only the DC power cables provided.

Site wiring must include an earth ground connection tothe DC power source. Grounding must comply with local,national, or other applicable government codes andregulations.

The following illustration shows a DC power cable: theD-Shell connector connects to one of thepower-and-cooling modules in the drive enclosure, andthe three lugs connect to an external DC power supply.

1.

Install the enclosure in the rack using proceduresdescribed in the HP MSA System RackingInstructions.

2.

Verify that both power switches are off.

3.

Check the DC cable part numbers and read thelabels carefully.

IMPORTANT:

One wire is labeled Ground;

the other two are labeled Positive andNegative.

4.

Connect a DC power cable to the firstpower-and-cooling module, using the D-shellconnector. Use the up arrow on the shell to ensureproper positioning before tightening.

5.

Tighten the screws at the top and bottom of the shellconnector with a torque between 1.7 N-m (15 lb-in)and 2.3 N-m (20 lb-in) to attach the cable securelyto the power-and-cooling module.

6.

Connect the wire labeled Ground to an appropriateearth ground.

7.

Securely connect the other ends of the DC powercable to a DC power source.

CAUTION:

If the enclosure is connected to

DC power sources that are not within thedesignated –48V DC nominal (–36 VDC to–72 VDC) range, it might be damaged.

8.

Using the instructions above, connect the secondDC power cable to the otherpower-and-cooling-module and to a DC powersource. If one power-and-cooling module fails, thesecond power-and-cooling module automaticallytakes the full load.

WARNING!

To ensure the safety ground,

at least one power-and-cooling module withan appropriately terminated ground leadmust be installed at all times.

> Grounding using a single wire from the front of thechassis ears <

1.

Attach the rear brackets to the Carrier-GradeEnclosure.

2.

Attach the left bracket assembly to the left rack rail.

3.

Attach the right bracket assembly to the right rackrail.

4.

Insert cage nuts into the rack holes.

5.

Align the Carrier-Grade Enclosure with the rails,and then slide it into the rack until the ears of theenclosure are about 1 to 2 inches from the rackfront rails.

6.

Attach a flat washer between the right mountingear (bottom hole) and the rack, and then looselyattach the bracket to the rear bracket assemblies.

7.

Attach the single-hole ground cable lug betweenthe front right mounting ear (top hole) and the rackwith a lock washer and screw. The recommendedtorque setting is 30 lbs-in for the 10-32 screwsprovided with the rack mount kit.

NOTE:•

The ground cable must be made of 10AWG or larger copper wire, terminatedwith a UL Listed compression lug.

•

Mating surfaces should be cleaned to abright metal finish and an antioxidantapplied before connections are made.

•

Thread-forming screws with externaltooth lock washers can be used to bondthe enclosure into a rack, if the rackpaint is removed between the rackmounting flange and the rack.